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The 3-(6-methylpyridin-2-yl)-6-(pyridin-2-yl)pyridazine 44 was prepared according to the general Stille coupling method, starting from a mixture of 2 g (5.23 mmol) of 6-methyl-2-tributylstannylpyridine 22, 666 mg (3.49 mmol) of 3-chloro-6-(pyridin-2-yl)pyridazine 8a, 208 mg (0.18 mmol) of tetrakis(triphenylphosphine)palladium(0) and 50 ml of freshly distilled toluene. The reaction medium is stirred at reflux for 18 h. The residue obtained is chromatographed on silica gel (eluent: ethyl acetate/petroleum ether=2/8). The coupling product 44 is isolated with a yield of 90%.

1. customThe 3-(6-methylpyridin-2-yl)-6-(pyridin-2-yl)pyridazine 44 was prepared
2. temperatureat reflux for 18 h
3. customThe residue obtained
4. customis chromatographed on silica gel (eluent: ethyl acetate/petroleum ether=2/8)